非补燃余热锅炉变工况性能计算模型及分析  

Calculation and analysis model of off-design performance for heat recovery steam generator without supplementary firing

作　　者：张学镭[1] 王松岭[1] 陈海平[1] 朱娜[2] 

机构地区：[1]华北电力大学能源动力与机械工程学院,河北保定071003 [2]山东省科学院能源研究所,山东济南250014

出　　处：《华北电力大学学报（自然科学版）》2010年第4期53-58,共6页Journal of North China Electric Power University：Natural Science Edition

基　　金：华北电力大学博士学位教师基金(93102802);中央高校基本科研业务费专项资金资助项目(09MG34)

摘　　要：余热锅炉的变工况性能对联合循环机组的安全经济运行有较大的影响。以具有整体除氧器的单压余热锅炉汽水系统为例,建立了余热锅炉过热器、蒸发器和省煤器设计工况和变工况的数学模型,给出了计算程序框图,得到了余热锅炉设计工况和变工况下的性能参数。结果表明:所建模型能够计算出变工况下余热锅炉汽水侧和烟气侧的参数;变工况下,非补燃余热锅炉的热端端差、节点温差和接近点温差主要受进口燃气温度的影响;余热锅炉的当量热效率主要受排烟温度的影响,降低余热锅炉的排烟温度是提高余热利用效率的主要措施。The performance of combined cycle is influenced greatly by heat recovery steam generator（HRSG）.Take a single pressure HRSG with an integral deaerator as example,the design and off-design performance models of super heater,evaporator and economizer were built in this paper.The calculation program frame was given,and the calculation results of HRSG were obtained.The results show that the model built in the paper can calculate the parameters of gas side and steam side of HRSG.The thermal-end temperature difference,pinch point temperature,and approach point temperature are mainly influenced by HRSG inlet gas temperature.Heat efficiency of HRSG is mainly influenced by its exhaust temperature,which shows that decreasing HRSG exhaust temperature can enhance the recovery rate of waste heat.

关 键 词：余热锅炉 性能 变工况 经济运行 燃气-蒸汽联合循环 

分 类 号：TK115[动力工程及工程热物理—热能工程]